| 11. | Other additives used in crown glasses include zinc oxide, phosphorus pentoxide, barium oxide, fluorite and lanthanum oxide.
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| 12. | In 1811 he constructed a new kind of crown glass and the German table glass both contained defects occasioning irregular refraction.
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| 13. | Other methods of producing hand-blown window glass included broad sheet, blown plate, crown glass and polished plate.
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| 14. | The company produced crown glass for windows, using sand from the " Lane bed " in nearby Lanesborough, Massachusetts.
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| 15. | The most common type of achromat is the "'achromatic crown glass such as BK7, which has lower dispersion.
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| 16. | Nearly everything inside is original, from the wide pine floors to the crown glass windows to the mammy bench in the kitchen.
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| 17. | Other methods of producing hand-blown window glass included : broad sheet, blown plate, crown glass and cylinder blown sheet.
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| 18. | Other historical methods for making window glass included broad sheet, blown plate, crown glass, polished plate and cylinder blown sheet.
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| 19. | If the highest Abbe value is desired, the only choices for common lens optical material are optical crown glass and CR-39.
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| 20. | A typical lens clock is calibrated to display the power of a crown glass surface, with a refractive index of 1.523.
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